Door-leaf for sidewalks, floors, &amp;c.



F. W. LEONHARD. DOOR LEAF FOR SIDEWALKS, FLOORS, 6L0. APPLICATION FILED OCT- 12. 1914.

Patented May 2, 1916.

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DOOR LEAF FOR SIDEWALKS, FLOORS, 6412.

APPLICATION FILED OCT. 2. 19M.

Patented May 2, 1916.

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FREDERICK W. LEONHARD, OF BUFFALO, NEW YORK.

DOOR-LEAF FOR SIDEWALKS, FLOORS, 8w.

Specification of Letters Patent.

Patented May 2, 1916.

Original application filed July 17, 1913, Serial No. 779,501. Patent No. 1,115,554, dated November 8, 1914. Divided and this application filed October 12, 1914. Serial No. 866,240.

To all whom it may concern.

Be it known that I, FREDERICK W. LEON- HARD, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Door-Leaves for. Sidewalks, Floors, &c., of which the following is a specification.

This invention relates to a panel or door leaf for sidewalks, floors or similar urposes and has the object td provide a oor leaf for this purpose which is practically indestructible, to provide such a door leaf having glass vault lights in a reinforced concrete slab and to provide such a door leaf which permits the glass vault lights to be placed directly on and locked to the tensile reinforcement of t-hefconcrete slab and give ace.

This application is a-division of- "an application on which Patent #1,115,554 was granted to myself, November 3, 1914.

In the accompanying drawings: Figure 1 is a vertical sectional elevation of a panel or door leaf embodying my improvements, taken in line 1-1, Fig. 2. Fig. 2 is a top plan view of the same partly broken away. Fig. 3 is.a fragmentary plan view, on an enlarged scale, of a door leaf showing the frame angles and details of vault lights, reinforcement and method of fastening same. Fig. 4 is a vertical section of the same. Fig. 5 is a vertical section showing the method of tying the minor reinforcement to the major reinforcement.

Similar characters of reference indicate corresponding parts throughout the several views.

In its general construction the panel or door leaf comprises two longitudinal sidebars 1, 1, a transverse heel bar 2 connecting the rear ends of the side bars, a transverse toe bar 4 connecting the front ends of the side bars, a longitudinal central bar 5 connected at its front and rear ends with the toe and heel bars, reinforcing wires 9 connecting the bars, bolts 11 and 12 for connecting the reinforcing wires with the bars, a slab 13 of concrete which is supported on the bars and in which said reinforcements are embedded, transparent vault lights 14 of glass or similar material, and metal sockets 0r receptacles 15 for said vault lights mounted on said reinforcement. The frame bars 1, 2, 4 and 5 may be standard rolled angles or may be special rolled shapes. The

bars 1, 2 and 4 form the four sides of a square or rectangular frame and the vertical legs or flanges of the same provide protec- ;tion for the edges of the concrete slab or 2, 4. The slab 13 is additionally supported by the reinforcement 9 and some members of the latter are attached to the longitudinal bar 5 thus dividing the rectangular frame into approximately two squares, each of which contains a section of the slab.

The reinforcement for the door slab 13 is composed of steel wire of high tensile strength and is divided into two parts i. e. the major 9 and the minor 10 reinforcements. The major reinforcement 9 is made by weaving the wires at right angles to each other. Along two sides of the slab 13 these wires have loops 9 at one end which engage the head 9 of a specially designed bolt 11 by means of which they are tied to the door frame bars. On the other two sides of the concrete slab the opposite ends of the wires 9 are stretched around and securely fastened to the adjacent frame bars by other specially designed winch bolts 12 by means of which any slack in these wires may be taken out and certain initial stress given to the same. The advantage of this tying and stretching these wires is five fold. First, it gives a taut rigid mesh in-which each wire is doing its full share of work, thus making the slab .13 capable of standing a load at least 10 to 12 times that of a slab reinforced in the ordinary manner or of a slab whose reinforcement is tied but not stretched. Second,

.the reinforcement is so rigid that it pracing surface and provide the nec ssary stiffness. Fourth, it permits placing the metal cups 15 incasing the glass vault lights 14 across one mesh, wrap once around the junction of the major reinforcement and allow the'free ends 10 to stick up vertically into the concrete. The object of this reinforce ment is to give a local support for the concrete and to' anchorthe concrete securely to the major reinforcement.

The special'bolt connections are two in number, the first being a tie bolt 11 and the second a winch bolt 121" The tie'bolt is similar to an ordinarybolt'except that the head 9 is elongated in the direction of the major reinforcing wire: which it'engages and. is provided at the outer'end of the elongation with :1 depending hook or lug 9 which receives-the loop 9* on the wire 9 of the major reinforcement. The advantage of this bolt is that it provides a quick and secure tie and'keeps the reinforcement at a certain definite distance from the bottom of the slab 13. The nose 9 of each bolt 9 is arranged close to or engages with the upper side of the frame so as to' confine the loop 9 of the respective reinforcing wire on its hook and prevent the saine from becoming displaced when this wire is put under stress preparatory to embodying the saine in concrete. The winch bolt T2 is also similar to an ordinary bolt with a hexagon head except that a vertical groove 12 is cut in one of its six sides. This groove is of such depth that the upturned part 12 of the wire 9 which is seated in this groove projects a little beyond the face or side of the bolt head. The object of this groove is best shown by the following explanation as to the method of fastening wire. The bolt 12 is placed in the punched hole of the lower horizontal flange of the respective frame bar with the head on the upper side and the nut 12 put on but not tightened. The wire of the major reinforcement is placed between the underside of the bolt head and the upper side of the lower horizontal flange of the frame bar and on the side of the bolt shank so that the pull of the wire around the shank of the bolt would tend to tighten the bolt. The wire is then pulled as tight as possible by hand and given a one eighth turn around the shank and then bent up into the groove in the bolt face.

head, as shown in the upper right hand part of Fig. 3. The wrench is now applied with one jaw gripping the side of the bolt head which contains the groove. This holds the wire securely and the bolt is turned until the wire is tightened the desired amount and then the nut is turned tight. The advantage of this is that it provides for the major reinforcement a quick and secure attachment, taking out all slack and giving a certain initial stress. bolt turns with the wire it thus prevents any local or concentrated stretch of the wire and possible injury therefrom.

The slab provides a wearing or walking surface and may beof cement or bituminous concrete or other suitable material. The concrete locks the metal receptacles for the vault lights laterally in place. The glass vault lights 14 are circular in plan and threaded on the circumference, as shown at 14, so as to screw into the metal receptacle. They are flat on the top and spherical on the bottom except 'a small flat shoulder 14 around the bottom edge which forms a seat forthe gasket 16. The extreme edge 14 of this shoulder is slightly acute so as to grip the gasket. The exterior of the metal receptacles is circular in plan at the upper surface and has an upper octagonal form 14 in the plane of the reinforcement and a lower octagonal form 14 at the lower sur- These two octagons are not of the same size in plan and are not equilateral but are formed of four alternate long and short sides. The four long sides of the lower octagon 14 produced would form a square slightly less in size than the square As the shank of the mesh formed by the wires of the major reinforcement. The two octagons are separated by a circular groove, channel or canal 15 which receives the major reinforcement and this canal forms an inscribed circle in the square formed by the. long sides'of the lower octagon. The advantage of this construction is that by placing the long sides of the lower octagon parallel with the wires of the major reinforcement the cup 15 drops through the mesh until the lower side of the upper octagon bears on the major reinforcement. The cup is then turned horizontally 45 degrees until the wire reinforcement lies iny'the circular canal.

This forms the vertical lock for the cup or receptacle and the surrounding concrete forms the horizontal lock. The inside of the cup is circular in plan and threaded to receive the thread of the glass vault lights. A clearance is provided between the inside of the cup and the vault light which is filled with suitable cement 15 to provide for expansion. Around the inside lower edge of the cu there is a shoulder 15 the edge of which is slightly acute so as to grip the gasket. The vault lights rest on the gasket which forms a tight joint and the gasket is held in place by a metal collar 15 which in turn is fastened to the underside of the metal cup by tap screws 15".

I claim as my invention:

1. A door leaf comprising a frame, reinforcing members extending across the space within said frame and consisting of wires, means for attaching said wires to said frame comprising bolts secured to the frame and provided with hooks receiving loops on said wires and each of which has its nose arranged close to the frame for confining the respective loop thereon, and a concrete slab arranged within said frame and receiving said wires.

2. A door leaf comprising a frame, reinforcing members extending across the space within said frame and consisting of wlres, means for attaching one end of each wire to said frame, means for tightening said Wires comprising bolts mounted on said frame and each adaptedto have a part of one wire wound around its shank and rovided with a notch in its head Whic is adapted to receive an upturned portion at the adjacent end of said wire, and a slab of concrete arranged within said frame and receiving said wires.

3. A door leaf comprising a frame, a reinforcement connected with said frame, a receptacle mounted directly on said reinforcement so as to be supported thereby, a glass light arran ed in said receptacle, and a concrete sla arranged within said frame and around said receptacle and receiving said reinforcement.

4. A door leaf comprising a frame, a reinforcement connected with said frame and comprising wires arranged at an angle to one another to form a mesh, a receptacle having grooves on its exterior which receive said Wires, a glass light arranged in said receptacle, and a concrete slab arran ed in said frame and around said receptac e and receiving said wires.

Witness my hand this 10th day of October, 1914.

FREDERICK-W. LEONHARD.

Witnesses:

Tmao. L. Porr, ANNA Harare. 

